. >> reporter: another potential speed bump to economic growth is the increase in payroll taxes, which is just beginning to show up. but some analysts say they hope it will be offset by new jobs and the new wages that come with them. brian? >> john yang starting us off in chicago tonight. john, thanks. >>> these gains in the stock market have come despite a big-ticket name having a rough time. apple announced some rough earnings numbers earlier this week. their stock has now taken a punishing blow. in fact, today apple lost its spot as the world's most valuable company. title goes back to exxon now. since apple has lost 37% of its value from its high point of more than $700 a share back in september. >>> across the country, as if thislu season wasn't bad enough already, it's now widespread in 47 out of the 50 states, remember. the cdc confirms what a lot of us already know from the workplace and the world around us. this other virus, the stomach bug that is making victims really miserable and they're dropping fast. more from our chief medical editor, dr. nancy snyderman. >> tonight, th